Process of recording sound.



G. K. CHENEY. PROCESS 0F RECORDING SOUND. APPLICATION FILED DEC. 12,1902. 941,010. Patented Nov. 23, 1909.

WITNESSES:

UNITED STATES PATENT OFFICE.

GEORGE K. CHENEY, on NEW YORK, N. Y-., ASSIGNOR, BY M snE as srsminnrsro VICTOR TALKING MACHINE OOMPAN Y, A CORPORATION OF NEW J ERSEY.

PROCESS OF RECORDING. SOUND.

Specification of Letters Patent.

Patented Nov. 23, 1909.

Application filed Dc'cemberlfl, 1902. Serial No. 134,914.

To all whom it may-concern:

Be it known that I, GEORGE K. CHENEY, a citizen of the United States ofAmerica, and a resident of the borough of Manhattan, city,

county, and Stateof New York,,have ,1n

vented certain new, and useful Improvements in Processes of RecordingSound, of which the following is a specification.

/ The main object .of this inventionis to provide an improved processfor producing .a true sound record from which may be obobjectionable,however,'to .a more or less extent, in that it has been suggested thatthe final record grooves'are liable to have rough places andirregularities which may result from the methods of their formation.

In the chemical process-- of forming records, the action of the reagentis uneven. on account of local differences in the structure of therecordblank, ppon which it acts, and therefore the surfaces of thegrooves formed thereby are not true and are cellular orpitted, whichresults in an unpleasant scratching sound during the reproduction of therecord.

In the engraving method, the record blank is usually formed of a more orless waxy and tenacious material, which, when not made homogeneous isliable to cause the engraving tool, which removes, in the form of chipsor shavings, a portion of the record blank to form the record groove toleave the record groove with surfaces more or less, uneven, because theharder particles of the tablet material may be torn or dragged fromtheir positions instead of being cut cleanly through bythe edges of thetool. a

The aim of my invention is to dispense with any chemical action and anycutting,

scraping or gouging action of the recording.

tool itself, substituting therefor a or ironing action of the tool.

One form of apparatus for carrying out pressing groove;

my improved method is illustrated in the accompanying sheet of drawingsin which:

Figure 1 is a side elevationpartially in section of the recordingapparatus shown in its relation to the recording tablet; Fig. 2.

an enlarged front view of the recording tool point; Fig. 3 a similarenlarged view showing the recording tool in operative position, and theshape of the groove formed thereby 1n the record tablet; Fi 4 anenlarged front view of the paring kni e in action removing the raisededges of the groove; and Fig. 5 is an enlarged cross section showing thecompleted groove. v

Referring to the drawings in which the same references are'usedthroughout the va-.

rious views to designate the same part,-the supporting frame 1 carries ahorn 2 and a sound box 3. The sound box is provided with the usualdiaphragm 4, to the center of which is attached the inner end 5, of abell crank arm, which is mounted on the torsional shaft 6. .The ends ofthe torsional shaft are rigidly set in sockets 7, 7 fixed on the soundbo'ix casing.

The recording point 8 is carried by the '80 laterallyby the verticalvibration of the dia-x I phragm acting through the bell crank armtorsional shaft 6- and is caused to vibrate 5, carried thereby. Theextremity of the recording the direction of the motion of the record tablet as shown in Fig. Land is wedge shaped in cross section as shown inFigs. 2 and 3.

oint 8 is inclined rearwardly The surface 9 of the record tablet formed.I

of some suitable displaceable material. This may be a composit1on ofsoap-like o wax like construction, or it may be of soft metal suchaslead or other material the molecules of which are capable of beingmoved one,

Figs. 3 and 4 represent at 11,-the record For forming records the partsare so adjusted that the point of the recording tool 8 sinks into therecord tablet as represented in Fig. 3, and the. paring knife 10 barelytouches the plane surface of. said record tablet, as indicated in Fig.4. Motion being given to the record tablet in the directionof the arrow,and sound waves being projectedinto the horn 2, the usual vibrations ofthe recording tool are produced and as the tablet 8 a vances, a sinuousline of even depth is formed in the tablet. On account of the backwardrake or inclination of the record ing tool 8, shown in Fig. 1, thetooldoes not cut or gouge or scrape out the material of the tablet 9 as thesame passes by it, but presses the material downwardly and toward eachside, ironing out a groove 11 having raised burs or ridges, 13, 13, onthe sides.

The paring knife 10, following after in.

as it has been packed and ironed down by the tool, and which are freefrom any cellular or pitted formation such as may be producedsby agouging, or tearing, or scraping action of a cutting or a more indentingtool.

Wherever in the specification or claims I use the expressions pressingimpressing, ironing, or the like, relative to the action of my tool onthe moving tablet, I

mean thereby to define the function of the tool in forming a groove inthe manner 1 above described, that is, without cutting, or

tearing, or gouging or scraping out of particles of the record material.

It is evident, of course, that various 4 changes might be made in thedetails of the process above described without departing from the spiritor scope of my invention. For instance, the paring down of the bur orridges might be done as a separate operation; other forms of recordingtool might be employed so long as the necessary backward inclination isretained to give the scoring and ironing action described and avoid anycutting or paring; the second step of I the process, the paring down ofthe .ridges 13, 13, might be omitted and a fairly accurate reproductionstill be obtained, but these and similar modifications, however, wouldstill leave the process within the boundaries of my invention.

Having thus described my invention, I

in a record blank of displaceable material,

by forcing by means of said stylus said material upwardly and laterallyunder pressure which smooths or irons the surfaces of said groove.

3. The method of recording sound waves, which comprises vibrating thestylus {by means of sound waves, impressing a sinuous groove in a recordblank of displaceable material, by gradually increasing the depth of,said groove by means of said stylus through downward and lateralpressure.

4. The method of recording sound waves, which comprises vibrating astylus by means of sound waves, impressing a sinuous groove in a recordblank of displaceable material by means of said stylus, the angle of thewalls of said roove being acute, whereby the material 0 the tabletisdisplaced laterally and upwardly.

' 5. The method of recording sound waves, which comprises vibrating astylus by means of sound waves, impressing an acute V-shapedsinuousgroove in a tablet of displaceable material by means of saidstylus, by displacing said'materi'al laterally and upwardly, andremoving the material displaced above the normal surface of the tablet.

6. The method of recordin sound waves, which comprises the followlngsteps: (1) forming a sinuous groove in a record blank of displaceablematerial, by displacing said material transversely and upwardly by.means of a stylus vibrated bysound waves,

and (2) paring away the material displaced above the normal surface ofthe tablet.

' 7. The method of recording sound waves, which comprises the followingsteps: (l) impressing a sinuous groove in a tablet of displaceablematerial, by displacing said material transversely and upwardly on eachside of said groove by means of a stylus vibrated by sound waves, and(2) cutting away the material displaced so that the same is level withthe normal, surface of the tablet.

8. The method of recording sound waves which comprises vibrating a toolin accord-- ance with sound vibrations and forming by means of said toola groove having an ironed surface, in a record blank of displaceablematerial.

9. The method of recording sound waves which comprises forming a groove,having an ironed surface corresponding to sound waves, in a record blankof displaceable material.

10. The method of recording sound waves which comprises forming agroove, having a smooth or ironed surface corresponding to sound 'avesin a record blank of displaceable material, and cutting away displacedmaterial at the edge of said groove.

11. The method of recording sound waves which comprises forming, asinuous depression corres 'ionding to sound waves in a record blank ofdisplaceable material, and then cutting away displaced material at theedge of said depression.

12. The method of recording sound waves which comprises forming asinuous depression having a compressed surface corresponding to soundwaves, in a record blank of displaceable material. j

13. The method of recording sound waves which comprises forming asinuous depression having a compressed surface corresponding to soundwaves in a record'blank and then removing a portion of the surface ofsaid blank adjacent to said groove.

15. The method of recording sound waves which comprises forming a groovecorresponding to sound waves in a record blank and then cutting away aportion of the surface of said blank adjacent to said groove.

16. The method of recording sound waves which comprises forming agl'OOVQ corresponding to sound waves in a record blank and then shearingaway a portion of the sur face of said blank adjacent to said groove.

Signed at New York, N. Y. this 25th day of November 1902.

GEORGE K. CHENEY.

\Vitnesses W. H. PUMPHREY, M. G. CRAWFORD.

